The fst_get_iface function in drivers/net/wan/farsync.c in the Linux kernel before 3.11.7 does not properly initialize a certain data structure, which allows local users to obtain sensitive information from kernel memory by leveraging the CAP_NET_ADMIN capability for an SIOCWANDEV ioctl call.
https://github.com/torvalds/linux/commit/96b340406724d87e4621284ebac5e059d67b2194
https://exchange.xforce.ibmcloud.com/vulnerabilities/90443
https://bugzilla.redhat.com/show_bug.cgi?id=1053610
http://www.ubuntu.com/usn/USN-2129-1
http://www.ubuntu.com/usn/USN-2128-1
http://www.securityfocus.com/bid/64952
http://www.openwall.com/lists/oss-security/2014/01/15/3
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.11.7